K. Jensen, California Institute of Technology, reports that soft x-ray emission in the region of the 1942 nova CP Pup has been observed by the HEAO A-2 group. The observed flux in the 0.15-0.5 keV band is 8.9 +/- 1.8 x 10**-12 erg cm**-2 s**-1. There is no detectable emission in the 0.5-2.0 keV band, but the group has determined a 2-signa upper limit to the flux in this band to be 4.4 x 10**-12 erg cm**-2 s**-1. CP Pup (R.A. = 8h09m.0, Decl. = -35o12', equinox 1950.0) is located in the 90-percent confidence region, which is centered at R.A. = 8h08m.1, Decl. = -35o13'. A search of this region has revealed no other compelling candidate for the source of emission. If CP Pup is the source, the softness of the observed x-ray spectrum, combined with the large expected interstellar absorption of soft x-rays, suggests a very steep spectrum in the 0.15-2.0 keV band.
International Astronomical Union Circular
- Pub Date:
- July 1979